I just released Xdebug 2.0.0RC3 through the web site and also through PECL. This hopefully last release candidate of Xdebug 2.0.0 addresses a number of segfaults and other small bugs that crept in in Xdebug 2.0.0RC2.

The Xdebug extension helps you debugging your script by providing a lot of valuable debug information. The debug information that Xdebug can provide includes the following: stack and function traces in error messages, memory allocation, protection for infinite recursions.